#region Copyright notice and license

// Copyright 2015 gRPC authors. Modified by AElfProject.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#endregion

using AElf.CSharp.Core;

namespace AElf.Runtime.CSharp;

internal interface IServerCallHandler
{
    bool IsView();
    byte[] Execute(byte[] input);
    object ReturnBytesToObject(byte[] returnBytes);
    string ReturnBytesToString(byte[] returnBytes);
    object InputBytesToObject(byte[] inputBytes);
    string InputBytesToString(byte[] inputBytes);
}

internal class UnaryServerCallHandler<TRequest, TResponse> : IServerCallHandler
    where TRequest : class
    where TResponse : class
{
    private readonly UnaryServerMethod<TRequest, TResponse> handler;
    private readonly Method<TRequest, TResponse> method;

    public UnaryServerCallHandler(Method<TRequest, TResponse> method, UnaryServerMethod<TRequest, TResponse> handler)
    {
        this.method = method;
        this.handler = handler;
    }

    public bool IsView()
    {
        return method.Type == MethodType.View;
    }

    public byte[] Execute(byte[] input)
    {
        var inputObj = method.RequestMarshaller.Deserializer(input);
        var response = handler(inputObj);
        return response != null ? method.ResponseMarshaller.Serializer(response) : null;
    }

    public object ReturnBytesToObject(byte[] returnBytes)
    {
        return method.ResponseMarshaller.Deserializer(returnBytes);
    }

    public string ReturnBytesToString(byte[] returnBytes)
    {
        return method.ResponseMarshaller.Deserializer(returnBytes).ToString();
    }

    public object InputBytesToObject(byte[] inputBytes)
    {
        return method.RequestMarshaller.Deserializer(inputBytes);
    }

    public string InputBytesToString(byte[] inputBytes)
    {
        return method.RequestMarshaller.Deserializer(inputBytes).ToString();
    }
}